Roll-grinder



s. HANSEN. ROLL GRINDER.

APPLICATION FILED MAR. 5. 19]9 Patented July 19, 1921.,

4 SHEETS-SHEET I.

S. HANSEN.

RQLL GRINDER.

APPLICATION FILED MAR- 5, I919.

Patented July 19, 1921.

4 SHEETSSHEET 2.

S. HANSEN.

ROLL GRINDER.

APPLICATION FILED MAR- 5. 1919.

Patented. July 19 9 19211. 4 SHEETSSHEET 3.

mam/7.

s. HANSEN.

ROLL GRINDER.

APPLICATION FILED MAR-5,1919.

L 2 9 1i 9 9 1 y m J m m M I 4 SHEETS-SHEET 4.

SVEND HANSEN, 0F BROOKLYN, NEW Y0, ASSIGNOR TO BIRMINGHAM IRON FOUNDRY, 0F DERBY, CONNECTICUT, 'A CORPORATION.

ROLL-GRINDER- Application filed March 5,

To all whom it may concern.

Be it known that I, SvnNn Hansen, a citizen of the, United States, residin at Brooklyn, in the county of Kings and tate of New York, have invented a new and useful Improvement in Roll-Grinders; and I do hereby declare the following, when taken in connection with the accompanying drawings and the characters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this application, and represent, in-

Figure 1 a top or plan View of a grinding machine construction in accordance with my invention.

Fig. 2 aside view of the same.

Fig. 3 an enlarged sectional view of the centering pin for the swinging table.

Fig. 4 a side View of the crowning bar, bearing box and the pivotalblock which it moves.

Fig. 5 a sectional view on the line 55 of Fig. 4 in connection with the ball-bearing raceways, crowning bar, and showin particularly the connection with the swinging table.

Fig. 6 a detached.

Fig. 7 an edge view of the same.

Fig. 8 a plan view of the crowning bar bracket.

Fig. 9 an edge view of the same.

Fig. 10 a plan View of the swinging table yoke.

Fig. 11 a side view of the same.

Fig. 12 a plan view of the swinging table bracket.

Fig. 13 a side view of the same.

Figs. 14, 15 and 16 are diagrammatlc views showing the position of the roll with respect to the grinding wheel at extreme points in the operation.

This invention relates to an improvement in roll grinders. It is desirable that rolls plan view of the crowning bar,

for certain purposes, such, for instance, as

rolling tinfoil, should have their faces convexed, as in usethe rolls being supported at their ends, if perfectly straight, will yield slightly so that the foil will be thicker at the center of the roll than at the sides, whereas if the rolls are slightly crowning or convexed when brought together under pres-' sure, they will yield atthe center and compensate for the convexity and produce a Specification of Letters Patent.

the top of which-is screwed a Patented July 19, 1921.

1919. Serial No. 280,821.

sheet of uniform thickness. Heretofore these rolls have been ground on two tapers or from a templet and an irregularity in the templet will be reproduced on the roll and these irregularities must be finally worked down by hand, requiring a large amount of time and constant. gaging.

The object of this invention is to provide a machine by which the surface of rolls may be ground to any desired curvature; and the invention consists in certain details of construction and combination of parts as will be hereinafter described and particularly recited in the claims.

In carrying out my invention I employ a grinding machine of usual construction comprising a bed 20 on which is a sliding carriage 21 on which is adjustably mounted agrinding wheel 22. Fixed in a flange 23 of the machine bed 20 is a pin 24 formed with pulley 35 connected with one of the cen-' tering points. Fixed to the carriage 21 and so as to move therewith is a crowning bar bracket 36 formed with a. downwardly extending lug 37 which is also bolted to the carriage so as to form a. firm connection therewith. At the center of the inner end of the crowning-bar bracket is a boss 38 into mounted on this pin is a straight bar 40 commonly called a crowning bar the outer end 41 of which rests upon a lip 42 between screws .43 and 44 mounted in lugs 45 and 16 in the crowning bar bracket and by which the outer end of the crowning bar may be adjusted. This crowning bar extends through a bearing box 47. The interior of this box is provided with hardened ballbearing plates 48 between which and the edges of the crowning bar 40 are ball bearings49 mountedinraceways 50 and 51 which are considerably longer than the length of the box. At the ends of the raceways are stops 52 to en age with the sides of the box d7. Mounted 1n the top of the box pin 39, and

is a pin 53 over which is set a block 54 which extends between arms 55 and 56 of a yoke 57 which is bolted tothe side of abracket 58 which in turn is bolted to the outer end sponding to the curvature to be given to the surface of the roll, the diameter of the roll at the center being only a few thousandths of an inch greater than the diameter of the rolls at the ends. Thecrowning bar being moved in the direction of the arrow 63 to the desired extent that crowning bar may be firmly clamped to the lip 42 by a set screw 64. As the carriage 21, carrying the grinding wheel advances, the grinding wheel contacts with the outer end of the roll as indicated in Fig. 14 so as to reduce that end tothe desired diameter, and as the grinding advances the crownin bar is pulled through the box 47, gradually crowding the yoke 57 outward, thus gradually swinging the table 27 on its center and gradually moving the roll away from the grinder until it reaches the center, as indicated in Fig. 15 of the drawings. As thegrinder advances the axis of the roll continues to turn in the same direction as before until the grinder reaches the other end of the roll, as indicated in Fig. 16 of the drawings, at which time that end of the roll will have been ground away to the same extent as the starting end. In

other words, the roll will have been given a true are the axis of which willco-rrespond to the extent to which the crowning bar has been adjusted. It is apparent, without illus tration, that should the crowning bar be adjusted in the opposite direction the roll will be 'ven a convex surface should such a form e desired for any particular purpose. The roll when ground is removed, the carriage reversed in position and another roll mounted between the centers preparatory to grinding,and' any number of rolls may be ound and present uniform surfaces. he raceways as shown, are made longer than the box so as to distribute the wear over a number of balls, but in case of along roll the stops 52 will engage with the side of the box 47- but not interfere with the longitudinal movement of the crowning bar through it.

With the construction shown,-the several parts are removable for replacement, and PI'OVlSlOIl 15 made for adjustment so that perfect accuracy may always be secured. As before stated, the cutting is made to a few thousandths of an inch so that sli ht "variation would make considerable di erence 1n the final result.

I claim 1 1. A roll grinding machine, comprising a sliding carriage carrying a grinding wheel, a centrally mounted swinging table mounted adjacent tothe sliding carriage, means for mounting a roll on said swinging table, means for revolving said roll, a crowning bar bracket connected with the sliding carriage, a crowning bar pivoted to the inner end of the crowning bar bracket, and means interposed between the said crowning bar and table to turn the table as the carriage 4 moves.

sliding carriage carrying a grinding wheel,

a swinging table mounted adjacent to the sliding carriage, means for mounting a roll on said swinging table, and means for turning said roll, a crowning bar bracket connected with the sliding carriage, a crowning bar pivoted to .the inner end of the crowning bar bracket and adjustably connected with the outer end of the bracket, a box through which the crowning bar extends, a. block connected with said box, a" yoke connected with the swinging table, andc-onnections-between the said block and yoke whereby the sliding movement of the crown-\ ing bar imparts a movement to the said swingingtable to turn the axis of the roll at an angle to the line of movement of the grinding wheel.

4. A roll grinding machine comprising a sliding carriage carrying a. grinding Wheel, a swinging table mounted adjacent to the sliding carriage, means for mounting a roll on said swinging table, and means for turning said roll, a crowning bar bracket connected with the sliding carria e, a crowning bar pivoted to the inner end 0 the crowning bar bracket and adjustably connected with the outer end of the bracket, a box through which the crowning bar extends, ball-bearing raceways between the crowning bar and box, a block connected with said box, a yoke connected with the swinging table, and connections between the said block and yoke whereby the sliding movement of the crowning bar imparts amovement to the said swinging table to turn the axis of the roll at an angle to the line of movement of the grinding wheel,

5. A roll grinding machine comprising a longitudinal movable grinding'wheel carriage, a centrally mounted swinging roll carrying table and means including a straight crowning bar interposed between said carriage and table to turn the table on its center as the carriage moves.

6. A roll grindin machine comprising a longitudinal movab e grinding wheei carriage, a centrally mounted swinging roll carrying table and adjustable means including a straight crowning bar interposed between said carriage and said table to turn. the table on its center as the carriage moves.

7. A roll grinding machine including a traveling-member, a centrally-pivoted member, a straight crowning bar adaptedto be turned to an angle with the path of movement of'the traveling-member, and a pivotal connection between the crowning bar and centrally-pivoted member, whereby the centrally-pivoted member is turned on its center as the traveling-member moves.

In testimony whereof, I have signed this specification in the presence of two subscribing witnesses. SVEND HANSEN.

Witnesses:

AGNES ANDERSON, MARIoN WHYTE. 

